
浏览全部资源
扫码关注微信
中国计量学院 计量测试工程学院, 浙江 杭州 310018
收稿日期:2014-05-08,
修回日期:2014-06-17,
纸质出版日期:2015-02-05
移动端阅览
范伟军, 张浩, 上官景仕, 余桂英. PWM数字可调均匀光源的设计[J]. 液晶与显示, 2015,30(1): 88-94
FAN Wei-jun, ZHANG Hao, SHANG-GUANG Jing-shi, YU Gui-ying. Design of the digital adjustable even lighter based PWM[J]. , 2015,30(1): 88-94
范伟军, 张浩, 上官景仕, 余桂英. PWM数字可调均匀光源的设计[J]. 液晶与显示, 2015,30(1): 88-94 DOI: 10.3788/YJYXS20153001.0088.
FAN Wei-jun, ZHANG Hao, SHANG-GUANG Jing-shi, YU Gui-ying. Design of the digital adjustable even lighter based PWM[J]. , 2015,30(1): 88-94 DOI: 10.3788/YJYXS20153001.0088.
发光二极管(Light Emitting Diode
LED)作为一种场致发光光源
已经获得广泛的应用
但在影像测量中的下照明领域还处于起步和探索阶段.影像测量中
光照不均匀或者光强不适
都会影响所拍摄图像的质量.为获得高质量的图像
设计一种基于PWM数字可调的均匀光源系统
用于下照明的影像测量.系统通过正交实验法获得环形的LED阵列、灯的倾角、LED灯的数量、LED的环形直径等
搭建光源系统
使得LED环形阵列在视场2 cm内获得均匀的光强
结合LED发光特性设计PWM脉冲发生电路
通过上位机的软件让均匀光源强度256级可调
适合各种不同的场合
增强实用性.实验数据表明
利用光学显微影像测量系统
在最小放大倍率0.7倍以及最大放大倍率4.5倍两种极端情况下
检测4个级别的光强均匀性都超过了83%.该系统完全能够在影像测量中达到要求.
LED (Light Emitting Diode
LED) source is a field luminescence source light. Video lighting measurement is still in the initial exploration stage although it has gained a wide application. Illumination uneven and light intensity discomfort will affect the quality of images. A digital adjustable even lighter system is designed based on PWM to obtain the high quality images for image measurement of under illumination. This digital adjustable even lighter system can obtain annular LED array
light angle
the number of LED lights
light ring diameter with the orthogonal experiment method. We also build a light source system to gain even lighter among 2 cm view field in the LED circular array. A circuit of PWM pulse generation is designed according to the LED light features to gain an even light of 256 adjustable intensity through the PC software on a variety of different occasion. Four different levels of intensity uniformity is tested in the experiment
and experimental data shows that the intensity uniformity reaches up to 83% at the field at 0.7X and 4.5X using an optical microscopic image
which meets the requirements of the image measurement.
孔祥伟. 组合光源与图像处理算法在工件表面缺陷中的应用[D].天津:天津大学, 2007. Kong X W. Combination of light source and image processing algorithms in the workpiece surface defects in the application [D].Tianjin:Tianjin University, 2007. (in Chinese)[2] 马祖怀. 大功率白光LED驱动研究以及驱动电路设计[D]. 西安:西安电子科技大学, 2011. Ma Z H. High-power white LED driver and a driver circuit design research [D].Xi'an: Xi'an Dian University, 2011. (in Chinese)[3] 向健勇,戚勇,苟超. 分时驱动式LED显示屏图像串扰的解决方法[J]. 液晶与显示, 2013, 28(3):398-402. Xiang J Y, Qi Y, Gou C. Solution of image crosstalk time-sharing driver LED display [J].Chinese Journal of Liquid Crystals and Displays,2013, 28(3):398-402. (in Chinese)[4] 汪晨. LED 显微镜均匀照明系统的设计[D]. 杭州:中国计量学院现代科技学院,2010. Wang C. The design of LED uniform illumination microscope system [D].Hangzhou: Modern China Institute of Metrology Institute of Technology, 2010. (in Chinese)[5] 杨光. 照明灯具中白光LED 阵列的排列及配光[J]. 灯与照明, 2008, 32(1):1-4. Yang G. White LED array and light distribution in LED lamps [J].Lamps and Lighting,2008, 32 (1):1-4. (in Chinese)[6] 闫峰, 孙文军, 王淑英. LED 照明光场照度均匀性的研究[J]. 光学技术, 2007, 33(增刊):327-328. Yan F, Sun W J, Wang S Y. Study of illuminance uniformity for LED illumination light field [J].Optical Technique,2007, 33 (Suppl):327-328. (in Chinese)[7] 李壮辉,朱清慧,任拥伟. 液晶显示应用控制系统设计与实现[J]. 液晶与显示, 2013, 28(6):889-894. Li Z H,Zhu Q H,Ren Y W. Design and implementation of liquid crystal display application control system [J].Chinese Journal of Liquid Crystals and Displays,2013, 28(6):889-894. (in Chinese)[8] 李晓寒, 何华平. 驱动白光LED技术综述[J]. 中国照明电器, 2010(9):9-11. Li X H, He H P. Overview on the technology of driving white LED [J].China Light and Lighting,2010 (9):9-11. (in Chinese)[9] 杨虎, 刘琼荪, 钟波.数理统计 [M]. 北京:高等教育出版社,2004. Yang H, Liu Q S, Zhong B.Mathematical Statistics [M].Beijing: Higher Education Press, 2004. (in Chinese)[10] 郭强, 刘志峰, 张爱平, 等. 基于STC89C52单片机的智能交通系统设计[J]. 机电一体化, 2008(11):85-92. Guo Q, Liu Z F, Zhang A P, et al.Design of traffic lights control module based on STC89C52 [J].Mechatronics,2008 (11):85-92. (in Chinese)[11] 白林,黄力,宋冬梅,等. 太阳能LED路灯智能控制系统电力控制与负载驱动[J]. 发光学报, 2009, 30(6):892-897. Bai L, Huang L, Song D M, et al.Inteligent control of electric power and load in LED streetlamp system driven by solar power [J]. Chinese Journal of Luminescence,2009, 30(6):892-897. (in Chinese)
0
浏览量
25
下载量
0
CSCD
关联资源
相关文章
相关作者
相关机构
京公网安备11010802024621